/Engine/Source/Runtime/Core/Public/Templates/SharedPointerInternals.h
Assignment operator adds a reference to the assigned object. If this counter was previously referencing an object, that reference will be released.
[FSharedReferencer](API\Runtime\Core\Templates\FSharedReferencer) & operator= ( [FSharedReferencer](API\Runtime\Core\Templates\FSharedReferencer) const & InSharedReference )